Abbreviations for energy and torque

Question

What are correct abbreviations for torque and energy in US Customary and S.I. systems? Both include distance and force. Do we write N-m and lbf-ft for both torque and energy? I always heard (years ago) torque expressed in "foot-pounds" of torque, meaning ft-lbf. I'm writing continuing education engineering courses and want to get terminology correct. Thanks

Answer 1

In SI the units for torque are Newton metres and the units for energy are Joules.

The two quantities have the same dimensions but not the same units. This has already been discussed several times. See for example Why is torque not measured in Joules?

I am fairly certain the US unit for torque is the foot pound as I know from experience this is used on US torque wrenches. I am not sure what the most commonly used unit for energy is, though some Googling suggests that the US may indeed use the foot pound for energy as well.